Single-control mechanism for radio tuning devices



Feb. 5, 1929.

E. A. KUEN SINGLE CONTROL MECHANISM FOR RADIO TUNING DEVICES Filed May 14, 1925 latented Feb. 5, 1929.

UNITED STATES EUGENE A. KUEN, OF CINCINNATI, OHIO.

SINGLE-CONTROL MECHANISM FOR RADIO TUNING DEVICES.

Application filed May 14, 1925.

This invention is particularly designed to p oduce a. single control mechanism for the instruments of a radio receiver, in which an object has been to simplify the tuning or set-- tins of the cooperating coi'idensers or similar aenistable devices by means of which the receiver is controllml to receive the desired signals from among the many signals of different wave length which may be in. the air.

A further object is to produce such a single control mechanism for the several condensers or other instruments of a radio receiver, as vi ll operat to secure t ieir adju tment without lost motion, throughout the entire range of the elfective operation of these instruments. and with the greatest of ease of manip ulati on.

'l hese and other objects are attained in mechanism described in the following specification and illustrated in the accouuninying d z'awin in which Fig. l is a front elevational view of the panel of a receiver equipped with the invention described herein.

2 is a rear view of the panel of the re ceiver showing the mechanism embodying the features of novelty described herein.

Fig. 3 is a view similar to Fig. 2, but showthe mechanism in a different position.

Fig. is an end elevational View of the receiver panel. and attached instrument with the controllin mechanism.

Fig. 5 is a view similar to Fig. 4, but of a different instrument and the controlling mechanism.

In the example of receiver which has been illustrated a type to which the invention may be applied, there has been chosen one which employs three variable condensers. By way of further example the chosen arrangement is such that one plain variable condenser 6, see Fig. 5, is centrally located on the panel and is operated directly by a large dial 7 secured to the condenser shaft 8 which e2:- tends through the panel as is usual. To each side of the plain condenser a Vernier type variable condenser is mounted see Fig. 4, but only the vernier plates 9 are controlled sepa rately by separate small control dials 10 and 11. The main plates 12 of the Vernier condensers are controlled simultaneously with those of condenser 6 through the large dial 7 by means of the mechanism which constitutes the novelty of the invention described herein.

This mechanism, which is shown quite clearly in Figs. 2 and 3, consists of but very Serial No. 30,178.

few and simple parts. On each condenser main shaft 13, 8 and 14, a double arm lever l5 is sec red, preferably back of the panel and between it and the conden mounted on it. Attached to the upper ar 15 is the .li 1h 16, and achod to the lower arms 15 0;. these lever. the lower link 17. The forn'iation of thcse links is particularly adapted to permit the rotation of the condenser plates through a complete half circle without interference i 'th the condenser shafts or other parts of the apparatus. T his is acciumilished by n'oriding extensions 18 on the links so that they will be completely clear of the condenser shafts even when they are lllOaQtl to the extreme positions shown in F 3. Now as to the operation of the apparatus shown, it is quite obvious that the rotation the single dial H 4 will bring about sin'uiltaneous operation of all the condense s, the action of the centrally located. actuating lever being such that when it is rotated it will d raw the links toward one another or Wil push them apart along a path describing an arc of a circle, the extreme positions being shown in 2 and :3. Such simultamsous adjustment of the condensers may perhaps secure but an approximate setting to bring in the desired station at full resonance. There fore, in order to bring about the eesired clcarness of reception there have been shown vernier condensers as the cooperating condensers, located. on each side of toe central condenser. These verniers as is usual, consist of the main section represented by the main plates 12 and the Vernier plates indicated by numeral 9. The main plates of each Vernier condenser are controlled in their adjustment by the main condenser shafts l3 and 14, while the Vernier plates are controlled by the vernier shafts l9 and 20 which extend through the hollow interiors of these main shafts and have the dials l0 and 11 mounted. on their projecting ends which extend through the panel Thus, after the original setting of the main dial the clearing up of the reception of the desired signal secured by adjusting the vcrnier controls 10 and 11.

' though there has been shown the specific gcmcnt of one plain and two Vernier condensers, this is merely by way of example and is intended to disclose one embodiment of the invention which consists of the links it) and 17 and the connections by means which they operate tie instruments to be adjusted from a single source of control.

Having thus described the invention what is claimed is:

1. A mechanism for controlling simultaneously several tuning instruments in a radio receiver, comprising a lever attached to the shaftof each of said instruments, and a link connecting the levers whereby when the shaft of one instrument is rotated all the instruments Will be operated simultaneously, said link having extensions adapted to permit movement of the instruments throughout the entire range of their effective operation without interference of said link with any portion of said instruments at any point of the operation.

2. A mechanism for controlling simul- EUGENE A. KUEN. 

